POLARÍMETRO POLARIMETER POLARIMÈTRE - Auxilab

Zuzi polarimeter 412 is based on the optical null principle to obtain accurate readings.For this purpose, it uses a LED diode as the light source. Firstly, the aperture (4.2) andthe lens (4.3) form a parallel light beam, that, after passing through the polarizer A (4.4)becomes a polarized light beam whose vibrating plane is 00’ (Figure 5a). When the polarizedlight beam passes through the Faraday coil (4.5), its vibrating plane will swing in a±β angle at a frequency of 50 Hz. After passing through the polarizer B (4.8) the light beamis projected into the photo-multiplier (4.9) so as an alternating current electric signal isgenerated.According to the optical null principle, the equipment takes as the optical null position(α = 0º) the point in which the axes of the polarizers A and B are orthogonally arranged(00’ ⊥ PP’) and therefore the light beam is completely blocked and does not reach thephoto-multiplier.When an optically active sample is placed, the vibrating plane will rotate into an α angle(Figure 5b) (optical rotation of the sample) at a certain frequency F that finally will becomean electric signal of the same frequency F. This signal makes the servo motor spin(4.14), which at the same time makes the polarizer A turn in an α angle until the opticalnull position is restored and the frequency F signal disappears (Figure 5c).The α angle that the polarizer A has rotated will be displayed as the reading of the opticalrotation of the analyzed sample.Figure 5a Figure 5b Figure 5cP0´0P´P0´a 0´ a0Note: 00’ is the polarization axe of polarizer A and PP’ is the polarization axe of polarizerBFigure 5a: The polarized light generated by the polarizer A vibrates in the plane 00’.Figure 5b: When light passes through an optically active sample its vibrating planeswings in a α angle.Figure 5c: The polarizer A rotates in a α angle to compensate the optical rotation of thesample and to restore the optical null position; the α value will be displayed with thecorrect sign.P´P0ENGLISHP´5. INSTALLATION / SETTING UPPreliminary inspection Unwrap the polarimeter, take off the involving plastic and take off the protection inwhich it comes fitted. Take off all the protective items and, without connecting the polarimeterto the net, make sure that it does not present any damage because of the shipment.In case the polarimeter presents any damage tell it immediately to your transport agentor dealer so that they can make the claims in the correct time limit. Please keep the original wrapping; you will always need it for returns enclosed with allthe accessories supplied. Please check that all the accessories are enclosed with the equipment:- 1 tube 100 mm-long - Fuses- 1 tube 200 mm-long - Screw driver- Set of rubber washers - Schuko wire- Set of glass joints - User’s manualWe will only accept any equipment return within 15 days after delivery and providedit comes in its original wrapping.InstallationBefore using this instrument, it is convenient for you to familiarize with its componentsand basic essentials.PLEASE READ THOROUGHLY THE INSTRUCTIONS BEFORE CONNECTINGAND OPERATING WITH THIS EQUIPMENT.ENGLISHPlease put the polarimeter on top of a horizontal, plane and stable table making a freespace of at least 30 cm per side. Do not put the polarimeter near any warm supply (burners, blowlamps…), nor exposeit directly to the sun, etc. Avoid vibrations in the working area. Avoid the presence of inflammable or toxic substances in the working area. The polarimeter is supplied with a Schuko standard wire. Please insert the wire thatfeeds the AC electric current in the base of current 220 V, 50 Hz ± 10% provided with earthwire and to the other end to the polarimeter connector (2.3).Neither the manufacturer nor the distributor will assume any responsibility for thedamages produced to the equipment during its installation or damages to persons sufferedby the improper use of the electric connection. The tension should be 220 V, 50Hz ± 10%.When you are not using the polarimeter for a long period of time please make sure it isPage 16 User`s manual 50410012 Version 5 January-2013Version 5 January-2013 User`s manual 50410030 Page 17